EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 193

• Manufacturer Part Number: EZ80F920120MOD
• Description: MODULE EZ80F92 512K 20MHZ
• Manufacturer: Zilog

Specifications of EZ80F920120MOD

• Module/board Type: Development Module
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 MB
• Interface Type: Cable
• Maximum Clock Frequency: 20 MHz
• Operating Supply Voltage: 0 V to 3.3 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: 0 C
• For Use With/related Products: eZ80F92
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3157; EZ80F920120MOD

PS015308-0404
ZDI Bus Control Register
The ZDI Bus Control register controls bus requests during DEBUG mode. It enables or
disables bus acknowledge in ZDI DEBUG mode and allows ZDI to force assertion of the
BUSACK signal. This register should only be written during ZDI DEBUG mode (that is,
following a BREAK). See ZDI Bus Control Register (ZDI_BUS_CTL = 17h in the ZDI
Register Write Only Address Space).
Table 101. ZDI Bus Control Register
(ZDI_BUS_CTL = 17h in the ZDI Register Write Only Address Space)
Bit
Reset
CPU Access
Note: W = Write Only.
Bit Position
7
ZDI_BUSAK_EN
6
ZDI_BUSAK
[5:0]
Value
0
1
0
1
000000
P R E L I M I N A R Y
W
7
0
Description
Bus requests by external peripherals using the
BUSREQ pin are ignored. The bus acknowledge signal,
BUSACK, is not asserted in response to any bus
requests.
Bus requests by external peripherals using the
BUSREQ pin are accepted. A bus acknowledge occurs
at the end of the current ZDI operation. The bus
acknowledge is indicated by asserting the BUSACK pin
in response to a bus request.
Deassert the bus acknowledge pin (BUSACK) to return
control of the address and data buses back to ZDI.
Assert the bus acknowledge pin (BUSACK) to pass
control of the address and data buses to an external
peripheral.
Reserved.
W
6
0
W
5
0
W
4
0
W
3
0
Product Specification
W
ZiLOG Debug Interface
2
0
eZ80F92/eZ80F93
W
1
0
W
0
0
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